Against which factions is it easier for demons to fight, and against which is it more difficult?

In the Necropolis army, the strongest unit is usually archer skeletons. With the help of portals, they can be easily blocked and only manage to fire one shot (although this is usually quite painful). Furthermore, a mass slow effect is applied to the Necropolis units, after which they move very rarely, and with a fast portal opening, the archers may not even have time to fire. Well, in general, Necropolis is not very effective against demons. IMHO.